Assiokob



G. a. DoREY FRICTION DRAFT RIGGING origin: sued Jan. a. 1922 .im 1s192e. Re. 16,364

Reima June 15, 1926.

UNITED STATES lPATENT OFFICE.

@zonen nnnrr Donny, or nvn'ns'roir, rumors, AssIaNon, BY amsn-nsalen-xmms, 'ro w. n. man, nrc., A conronarrorr.

FBICTION DRAFT BIGGING.

Original No. 1,493,192, dated lay 6, 1924, Serial No. 528,010 lcdJanuary 9, 1922. Application for reissue led February 15, 1926. SerialNo. 88,507.

f My invention relates to improvements in frctional draft riggings asapplied to railway cars and the Vlike and has particular reference tothat type wherein casings are used in connection with wedging elementsto secure high resistance and great cushion- One of the main objects ofm invention is to sprovide a draft ri ging w reln friction oes engagethe si e walls of a casing land are movable relatively thereto.

Another objectof my invention is'to dispose the variousl frictionalelements -in the l5 greatest transverse thrust will be in the bottom ofthe casing, thereby securing the full benefit of the cohesion betweenthe end walls and side walls of the casing to prevent rupf ture of thismember. v

A further object of the invention is to provide a removable wear latebetween the casin end wall and the friction element.

It 1s also an object of the present invention Vto provide a frictiondraft rigging'havng a casing with friction shoes in engagement with theside walls thereof and tov provide means whereby these shoes willfunction in unison. Hitherto when friction shoes which have been widelyseparated from each other have 'been employed in this manner there hasbeen a tendency for one shoe to move past the-other and so impair theeiciency of the l rigging. In myinvention this deficiency has beenovercome by vproviding at one end of the 'shoes non-contractible memberswhich extend from one shoe toV the vother and exert longitudinal as Wellas transverse pressure thereon.

Provision has also been made to ensure the certain release of thefrictional elements after compression.

With these ends in view and other details of novelty such as will bemore particularly Y inted out hereinafter, my invention resides 1n thepeculiar construction, arrangements ndombinations of parts ashereinafter set ort For a fuller comprehension of my nvenf tion,reference must be had to the accompanyn drawings wherein like referencesieate like parts.

part of this the drawi foi-min me" sation, Flig@ 1 i* Euhw 1mi tudinal,sectional view of a railway draft rigging, showingl my improvements inconnection therewit Ithe vrigging taken on the line '2 2 of Fignre2.-

Figure 4 is a pers ective view of one of y.the transversely andongitudinally'movable members known as wed-ge casingin order that thosewhich have the blocks.

Figure 5 is a perspectlve view vof the central wedge block.

Figure 6 is a perspective view of the combined spring seat and spreadermember.

Figure 7 1s a perspective view of the follower member.

Figure 8 is a perspective view of one of the friction shoes.

In the drawings, 2 represents the drawbar of the coupler connected bymeans of key 3 to the yoke 4 in the usual manner, the yoke embracingcasing 5 and the whole being locatedy between the center sills 6 6. Inthe illustration the casing is formed to abut against front stops 7secured to the center sills by means of rivets 8, rear stops 9 alsosecured to the center sills in like manner constitute draft gearabutments under buing strains.

The casingIk 5 is preferably formed of rectangular section with one endclosed andthe other end open, the bottom wall 10 being reinforced with acorrugation 11,'extending in the form of a circle and providing a veryrigid member for the purpose lof sustaining the strain due tocouplershocks. A friction plate 15 is fitted in the bottom of the casingand is formed with a recessed portion corresponding to the corrugationin the casing and designated as 15* while the outer surface of theplateias at 15" is made to ac t as a friction surface. In this manner asthe plate wears away it may be readily renewed without thek necessity'of discarding the entire casing. The side walls of the casingconstitutie friction surfaces as at 12 and register with surfaces of thefriction shoes in a ma ner to hereinafter expained bile t e top anbottom wslisli me as t ai tu piavnt ruptura of the @imag incidental tothe transverse thrust caused by the frietonal elements. vThe outer edgeof the easing walls as at 14 serves as an abutment for the followermember when the gear is fully compressed, thereby relieving thefrictional elements of undue strain. The surface 15b of the frictionplate 15 registers with the surfaces 16a of the wedge blocks 16. Thelatter members are each formed with three bearing surfaces as shown inFigure 4, the wedge surfaces 16c being adapted to coact with wedgesurfaces 17a of the central wedge member 17 which is disposed betweenthe wedge blocks 16 and adapted to be moved in a longitudinal direction.The surface 17h forms an abutment for the outer spring 18 and also forthe inner spring 19. A' hole 17 fis provided in the central wedge memberfor the pasnge of the bolt 24 which extends longitudinally throughoutthe gear. A recess is also provided in the wedge blocks 16 as shown at16*i for the purpose of providing clearance for the central bolt whenthe wedge blocks have moved transversely towards each other as shown inFigure 2.

Friction shoes 20 are disposed on each side of the casing 5 within thismember and Asurfaces 20 of these shoes co-act with surfaces 12 of thecasing-. The inner ends of the shoes are formed with inclined surfaces20b adapted to register with surfaces 16" of the Wedge blocks 16. Theouter ends of the shoes are formed with oppositely inclined surfaces 20and 20d which are connested with theother end of the shoes by meansofflanges 20c serving to reinforce the shoes 'nst bending. The centrallwedge blocksguhave the corners recessed as at 17li for the purpose ofproviding clearance at the flanged portion of the shoes.

A spring seat 21 extending from shoe to shoe is formed with wedgingsurfaces 211b adapted to register with similarly inclined surfaces ofthe shoes as at 20d. The corners of the spring seat are recessed toprovide clearance for the flanged portion of the shoes, such recessesbeing designated as 21a. The flat surface 21c forms an abutment for theouter spring 18 While the inner spring 19 extends longitudinally throughthe member 21 passing through the hole 21d formed therein for thispurpose vand abuts against the surface 22s of the follower member 22.The follower member is preferably formed to Ict as a spreader throughthe agency of the sloping surfaces 221 which register with the inclinedsurfaces 2On of the shoes. The surface 22C is preferably made flat toform a solixl abutment ou the casing ed e at 14. .A hallowed out portionis forme in the 'follower member for the reception of the mat 23 wherebythe bolt 24 serves to retain the r in its assembled relation.

operation of the draft rigging takes phen u follows: In draft orV bullngstrains .the casing walls, which action is further the draft rigging iscompressed by the approach of the follower member 22 to the casing 5.This movement causes the friction shoes 2O to be moved inwardly into thecasing, and by reason of the contact between the inclined walls 20@ andthe wedge blocks 16, the latter members will be moved transverselytoward each other, displacing the central wedge member 17 in a directionopy posite to the movement of the shoes, thereby compressing the springsfrom the closed end of the casing. The transverse reaction due to thiswedging action forces the shoes in close frictional engagement withaugmented by the follower member 22 and spring seat 21, inasmuch as bothof these members are formed with inclined bearing surfaces whichregister with similarly inclined bearing surfaces on the shoes.

As the shoes move inwardly in the casing, the spring seat 21 moves inunisontherewith, thereby compressing the spring in the same ratio, andconsequently it will be seen that the spring is Ycompressed from bothends of the gear at the'same time. The out- 'ward thrust is alwaysmaintained on the shoes by thisouter spring 18, inaslnllich as there isalways a certain amount of initial compression in the spring whichserves to give great shock absorbing capacity from the very start of thecompression movement. This outward thrust is also exerted by the wedgingaction of the follower member 22 through the medium of the inclinedWalls V22".bearir 1g on the inclined walls 2Oc of the shoes.

On the maximum compression being reached, the follower member abuts onthe edge 12 of the casing 5, thereby greatly ic- 105 lieving thefriction elements of excessive strain.

lVith the intrduction of Vlarge bearing areas in draft riggings, it hasbecome a matter of frequent occurrence for some of the membersto bind,owing to some of the various elements having varying degrees ofroughness in the friction surfaces and so perrnit the other frictionalelements to move past the others. In this particular invention provisionhas been made to guard against such a possibility by guiding-the centralwedging member and preventing any sidewise movement thereof. Any unusualdisplacement of any of the parts 120 would immediately be reflected by asidewise movement of this member and consequently special provision hasbeen made to cause it to travel at all times in a straight line, byhaving the guide ianges`20"r of the 125 shoes fit in the corners of thewedge member at 17d and also through the medium of the bolt 24 whichpassing through the entire mechanism serves .to centralize the member17. 130

' cause the plrovisio'n hasy alsobeen made to s loes toV move in unisonby exerting outward pressure thereon at the opposite ends thereof atthree distinct places, the compressible mechanism exerting pressurethereon at' the outer end and the opwedlgingsurfaces of the spring seatand the fo ower exerting pressure thereon at two distinct'places at theinner end thereof.

On release of the 'mechanism the inner spring 19 moves the followermember out of Special `leriglige'ment with theshoes' and at the same"timethe y through the spring seat moves the prsure of the outer springex- -shocsbodily forward.- During this action, the compressiblemechanism at the other end of the casing is also expanded outwardly,reacting agalnst the inclined surfaces of the shoes and therebyassisting the return movement'of the parts.v

`VVllile I have'herein shown and described i what I now consider to bethe preferred embodiment of the invention, the same 1s and a s ringmerelyY "illustrative, and I contemplate all changesand' modificationswhich come within the scope of the appended claims.

I claim:

1. In a friction shock absorbin mechanism, the combination'with afriction shell; of longitudinally dis sed friction shoes coacting withsaid shel wedge pressure transmittin means co-acting with the oppositeends o said shoes, said wedge pressure transmitting means at one end ofsaid shoes including a pair of wedge members co-acting respectlvely withthe inner and outer wedge faces at the corresponding ends of said shoes;resistance interposed between the we ge pressure transmitting means at"one end of the mechanism and the wedge member co-acting with the innerfaces of the shoes.

2. In a friction shock absorbmg mechalns`m,fthe combination with afriction shell;

of longitudinally disposed friction shoes coacting with said shell,eachv of said shoes vvhaving an' outer wedge face at one end thereof,outer and inner wedge faces at'the yoppositie end thereof; wedge ressuretransmitting means at opposite ,en s of the mechanism, includi wedgemembers co-acting respectively wit the outer and inner wedge faces ofsaid shoes; and a spring resistance co-acting with said wedge pressuretransmitting means.

3. In a friction shock absorbin mechanism the combination with a she oflongitudinally disposed friction elements coactingwith said shell, eachof sai-d elements being provided with outer wedge faces at i theopposite ends thereof, each of said elements also having an inner wedgeface thereon at one end thereof; wedge ressure transmitting means atopposite en of the mechmism co-acting respectively with the outerbetween the wedge pressure transmltting means at one end of themechanism and the wedge member.

4. In a friction shock absorbing mechanism, the combination with afriction shell; of longitudinally disposed friction elements co-actingwith said shell, each of said 'elements being provided with outer wedgefaces at the opposite ends thereof, each of said elements also having aninner we face at one end thereof; a pair of wedge b ocks at one end ofthe mechanism havin wedge faces co-acting with the outer we ge faces atone end of said shoes; a Wedge member co-acting with the outer wedgefaces at the other end of said shoes; a spring follower having wedgefaces co-acting with Asaid wedge blocks; a second spring follower havingwedge faces co-acting with the inner wedge faces of said shoes; a springresistance element interposed between said followers; and a secondspring resistance element interposed between said wedge member and oneof said followers` 5. In a friction draft rigging, the combination witha casing including an end wall having a raised portion formed therein;of a'plate adapted to present on one side a recessed portion to fit overthe said raised portion of the casing and presenting on the oppositeside a bearing surface for frictional elements.

6. In a friction shock absorbing mechanism, the combination wi-th acompressible mechanism including a central wedge member; of frictionshoes adapted to co-act upon said compressible mechanism and displacethe central wedge member, said shoes having flanges thereon and saidWedge member having the corners recessed to provide clearance for theanges of said shoes.

7. In a friction shock absorbing mechanism, the combination with acasing; of a spring resistance comprising aplurality of springs,friction shoes co-acting with said casing; and oppositely disposednon-compresslble wedging members at `one end of said shoes operatlngy toforce the shoes outwardly against the casing walls, one of said wedgingmembers being adapted to form an abutment for one of said springs andoperating to resist inward movement of the shoes, said member having anopening formed therein permitting another of said springs to extendoutwardly therethrou h and resist inward movement of the ot er Wedgingmember.

8. In a friction shock absorbing mechanism, the combination with afriction shell; of a pluralit of friction shoes co-acting with the shel, said shoes havin wedge faces at opposite ends thereof; a wedgepreseure transmitting member co-acting with the wedge faces at one endof the shoes; a 'plurality of auxiliary wedge blocks co-acting wit thewedge faces at the other end of said shoes; a spring seat having Wedgefaces thereon co-acting with said auxiliary wedge blocks; and a springresistance interposed between the wedge pressure transmitting member andthe spring seat.

9. In a friction shock absorbing mechanism, the combination with afriction shell having a plurality of longitudinally extending interiorfriction surfaces; of a plurality of friction shoes co-acting with saidshell friction surfaces, said shoes having wedge faces at the oppositeends thereof; a wedge pressure creating means, said wedge pressurecreating means including a plurality of wedge members disposed atopposite ends of said shoes, certain of said Wedge members having wedgefaces co-actingrespectively with the wedge faces at the opposite ends ofthe shoes; and a spring reinstance interposed between the wedges at theopposite ends of the shoes.

10. In a friction shock absorbing mechanism, the combination with afriction shell having a plurality of longitudinally extending interiorfriction surfaces; of a spring resistance; a plurality of friction shoescoacting with said shell friction surfaces, said shoes having wedgefaces at lthe opposite ends thereof; a pressure transmitting memberhaving Wedge faces co-acting with the Wedge faces at one end of saidshoes; a plurality of wedge blocks each having a plurality of wedgefaces, certain of which coact with the wedge faces at the other end ofsaid shoes; and a wedge member interposed between said blocks andco-acting with the remaining wedge faces thereof.

11. In a friction shock absorbing mechanism, the combination with afriction shell having a plurality of longitudinally extendingfrictionsurfaces and a transversely extending rear friction surface; ofa plurality of friction shoes co-acting with said longitudinallyextending surfaces; a plurality of wedge blocks sliding on saidtransversely extending surface, said blocks and shoes being providedwith co-acting wedge faces; a wedge pressure transmitting member, saidmember and shoes having co-acting wedge faces; a spring followerco-acting with said wedge blocks; and a spring resistance interposedbetween said member and said follower. v

12. In a friction shock absorbin mechanism, the combination with afriction shell having a plurality of interior friction surfaces; of aplurality of friction elements coacting with said shell frictionsurfaces, said elements having co-acting wedge faces; a wedge pressuretransmitting means adapted to engage certain of said elements and movethe same longitudinally of the shell; therebl moving the remainingelements toward eacli other transversely of the shell; and yieldingmeans opposing movement of said lastnamed elements toward each other.

13. In a friction shock absorbing mechanism, *the combination with afriction shell having a plurality of interiory friction surfaces, saidsurfaces extending both longitudinally and transversely of the shell; ofa spring resistance; a plurality y of friction shoes co-acting with saidshell friction surfaces; pressure tra-nsmittin means for effectingmovement of certain o said shoes longitudinally of the shell, saidlast-named shoes and pressure transmitting means having coacting wedgefaces; and (zo-operating means on said last-named shoes and theremaining shoes for effecting movement of the latter transversely of theshell.

14. In a friction shock absorbi mechanism, the combination with afriction shell having interior friction surfaces; of a springresistance; a wed e acting spring follower; a plurality of we gefriction shoes co-acting with said shell friction surfaces and movableinwardly of the same during compression of the mechanism; a ressuretransmitting means cooperating with said spring resistance adapted tomove said slices inwardly' of the shell; and wedge blocks disposed on oposite sides of the mechanism, said blocks being interposed between saidspring follower and wedge shoes, whereby the spring follower is movedtoward said means during the compression of the mecha'- nism.

In witness that I claim the foregoing, I have hereunto subscribed myname, this 14th day of Aprih 1926. 4

GEORGE BINET DOREY.

